Electrical annunciator



(No Model.)

'y G. E. PAINTER.

ELECTRICAL ANNUNGIATOR.

UNITED STATES PATENT Erica G\VYNNE E. PAINTER, OF BALTIMORE, MARYLAND.

ELECTRICAL ANNUNCIATOR.

SPECIFICATION forming part of Letters Patent No. 348,045, dated August 24l 1886,

Application filed October 3l, 1885. Serial No. 181,500. (No model.)

To all whom it 72mg/ concern:

Be it known that I, GwYNNE E. PAINTER, of Baltimore, in theSt-ate of Maryland, have invented certain new and useful Improvements in Electrical Annunciators; and I do hereby d o clare that the following is a full and acruraie description of the same.

This invention relates to that class of electrical annuncia-tors wherein a pendent index is deflected by an electro-magnet temporarily excited to attract attention to the number or sign indicating the locality which demands attention. The period of excitation is frequently very short, so that the index is attracted for an instant only, and the residual magnetism in the core is seldom sufficient to hold the index in its position of deflection sufiiciently long to secure attention.

The object of my invention is to provide a lock to hold the index in its position of deflection until released by act of the attendant.

That others may fully understand my invention, I will particularly describeit, having reference to the aocompanyingdrawings, Awhere- Figure l is aperspective View of my indexes and lock. Fig. 3 is aside elevation of the same.

A is the inclosing-case of my annunciator, B being the dial, and C one of the pendent indexes pivoted to the dial.

D is a small single'spool electromagnet with a long core, d, projecting ont through the dial.

^ The pendent index constitutes or is carried by an unpolarized armature, and hangs a little ways at one side of said magnet-core, but not out of the magnetic field, so that whenever the magnet is excited the index will be attracted and deflected. To catch and lock the index when so dellected, I attach to the cored a side arm, f, of soft iron, and above it,mount ed on a delicate spring, a small armature, y, which carries a pin, 7L, the normal position of which is close to the index,but between it and the core d. When the core d becomes magnetic, the arm f becomes magnetized also, and the index Gand armature gare simultaneously attracted. The depression of said armature removes the pin h from its position by the side of the index,and permits said index to swing freely to the core passing over said pin. Vhen Fig. 2 is a plan of one indicator.`

the core is discharged of its magnetism, the armature moves outward again, carrying the pin with it to theonterside of the index,which is thereby prevented from resuming its normal perpendicular position. This is an automatic lock, to maintain the index in its position of deection until it shall be observed and released by the attendant.

Any proper orusual 'device for restoring the index to its normal position may be employed. I prefer the ordinary push-bar, c,with its pin Z, to engage the side ofthe circular head of the index or some other proper portion thereof, and forcibly move it to its normal perpendicular position. At the Sametime a pin or cam, n, on said push-bar engages an inclined camsurface, p, on the armature g or its arm, and depresses the same withits pin hf, to permit the index to pass again over the same. When the push-bar 7c returns to its normal position, it leaves the index with its magnet and lock in initial position7 ready for another impulse.

Having described my invention, I claiml. In an electrical annunciator, an electro. magnet with a projecting core and an unpolai-ized armature suspended within the field of said magnet, and carrying an indcx,combined with a spring-retracted armature and a pin or stud attached thereto normally located between said index and core, whereby when said magnet is excited the armature and pin will be depressed by the sameimpulse which causes said index to swing, and at the discontinuance of said impulse said pin will assumea position on the opposite side of said index, to prevent its return to to its initial position, for the purposes set forth.

2. In an electrical annunciator, an electromagnet and pivoted index suspended in the magnetic field, combined with the arresting-pin carried by an unpolarized armature in the same magnetic field, whereby said index is locked against movement by residual magnetismin one direction and against movement by grav ity in the other, substantially as set forth.

3. The electro-magnet D, the pivoted index C, suspended in the magnetic field, combined with the armature g, also in the magnetic field, and arresting-pin h, carried by said arm and controlled by the same electrical impulses which move the index, whereby said index is IOO prevented from deflection in advance of the by, and the camp, attached to the armature, electrical impulses and prevented from retnrncombined with the push-bar k, provided with ing to its initial position after said impulses. the pnshpin l and the cam n, whereby the nrl5 4. The electro-magnet D, provided with the resting-pin h is depressed and said index is 5 lateral arm f, the pivoted index C, hanging in forcibly returned to its initial position by the the field of said magnet, the armature g,monnt same movement. ed on a spring above said lateral arm f, and the pin h, carried by said armature, for the A GVYNN E E. PAINTER. purposes set forth.

IO 5. The eleotrofmagnetD, the pivoted index VibneSSeS:

O, hanging in the field of said magnet, the ar- NV. PAINTER, mature g and arresting-pin 71 carried there- CHARLES H. BOND. 

